Thermoplastic poly(arylene ether) / polyester blends and articles thereof

ABSTRACT

Disclosed herein is a polymer composition comprising: a poly(arylene ether); a polyester; electrically conductive filler, and an impact modifier. The composition has a continuous phase comprising polyester and a disperse phase comprising poly(arylene ether). The amount of the disperse phase is less than 35 weight percent, based on the total weight of the composition.

BACKGROUND OF THE INVENTION

Disclosed herein is a blend of poly(arylene ether) and thermoplasticpolyester that exhibits enhanced properties, such as improved impactstrength and nominal strain at break.

Poly(arylene ether)s are commercially attractive materials because oftheir unique combination of properties, including, for example, hightemperature resistance, dimensional and hydrolytic stability, andelectrical properties. Combinations of poly(arylene ether) withpolyesters into compatibilized poly(arylene ether)/polyester blends areknown. Compatibilized poly(arylene ether)-polyester blends seek toachieve a balance of properties needed for commercial applications, suchas dimensional stability and impact strength. Unfortunately, knownpoly(arylene ether)/polyester blends do not provide a sufficient balanceof properties to make them commercially attractive. It is thereforeapparent that a need continues to exist for compatibilized poly(aryleneether)/polyester blends, which overcome some or all of theaforementioned difficulties.

BRIEF DESCRIPTION OF THE INVENTION

The needs discussed above have been addressed by a thermoplasticcomposition comprising:

a polyester;

a poly(arylene ether) wherein a portion of the poly(arylene ether) isfunctionalized poly(arylene ether); and

an impact modifier;

wherein the composition comprises a continuous phase comprisingpolyester and a disperse phase comprising poly(arylene ether) and theamount of the disperse phase is less than 35 weight percent, based onthe total weight of the composition. In the absence of electricallyconductive filler the composition has a notched Izod value greater thanor equal to 10 kilojoules per square meter as determined by ISO 180/1Aand a nominal strain at break greater than or equal to 20% as determinedby ISO 527. When the composition comprises electrically conductivefiller the composition has a notched Izod value greater than or equal to6 kilojoules per square meter as determined by ISO 180/1A and a nominalstrain at break greater than or equal to 15% as determined by ISO 527.

Also described herein is a thermoplastic composition produced by meltblending:

a polyester;

a poly(arylene ether) wherein a portion of the poly(arylene ether) isfunctionalized poly(arylene ether);

an impact modifier; and

a polymeric compatibilizer having an average of greater than or equal to3 pendant epoxy groups per molecule;

wherein the composition comprises a continuous phase comprisingpolyester and a disperse phase comprising poly(arylene ether) and theamount of the disperse phase is less than 35 weight percent, based onthe total weight of the composition. The composition, in the absence ofelectrically conductive filler, has a notched Izod greater than or equalto 10 kilojoules per square meter, as determined by ISO 180/1A and anominal strain at break greater than or equal to 20% as determined byISO 527. When the composition additionally comprises electricallyconductive filler the composition has a notched Izod value greater thanor equal to 6 kilojoules per square meter as determined by ISO 180/1Aand a nominal strain at break greater than or equal to 15% as determinedby ISO 527.

Also described herein is a thermoplastic composition produced by meltblending:

a polyester;

a poly(arylene ether);

an impact modifier;

a functionalizing agent; and

a polymeric compatibilizer having an average of greater than or equal to3 pendant epoxy groups per molecule, wherein the composition comprises acontinuous phase comprising polyester and a disperse phase comprisingpoly(arylene ether) and the amount of the disperse phase is less than 35weight percent, based on the total weight of the composition. Thecomposition, in the absence of electrically conductive filler, has anotched Izod greater than or equal to 10 kilojoules per square meter, asdetermined by ISO 180/1A and a nominal strain at break greater than orequal to 20% as determined by ISO 527. When the composition additionallycomprises electrically conductive filler the composition has a notchedIzod value greater than or equal to 6 kilojoules per square meter asdetermined by ISO 180/1A and a nominal strain at break greater than orequal to 15% as determined by ISO 527.

Methods for preparing the compositions and articles comprising thecompositions are also described.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 to 8 are transmission electron micrographs of Example 12 andComparative Examples 7-9.

DETAILED DESCRIPTION OF THE INVENTION

Previously available poly(arylene ether)/polyester compositions havesuffered from unstable phase morphology. In compositions having unstablephase morphology the distribution and size of the disperse phaseparticles change significantly when the composition is subjected toprocessing steps such as injection molding. During injection molding thecomposition is softened sufficiently to permit the composition to flow.Molding occurs under high shear and the combination of softening andhigh shear permits the disperse phase to exhibit coalescence incompositions with unstable phase morphology. Stated another way,disperse phase domains of compositions having unstable phase morphologycoalesce under conditions of softening and high shear. This leads tomolded parts with insufficient physical properties such as impactstrength because the distribution and particle size of the dispersephase has a significant impact on the physical properties. This isparticularly true in large injection molded parts because thecomposition usually experiences longer residences times in a softenedstate at high shear.

The composition described herein is a compatibilized poly(aryleneether)/polyester composition having stable phase morphology. Thecomposition exhibits a unique combination of good heat resistance,dimensional stability, nominal strain at break and impact properties.Surprisingly it has been discovered that the amount of the dispersephase comprising poly(arylene ether) in relation to the amount of thetotal composition is critical to the formation of a stable morphology.The disperse phase comprising poly(arylene ether) is present in anamount that is less than or equal to 35 weight percent (wt %) based onthe total weight of the composition. The impact modifier may reside inthe disperse phase but may also be present at the interface between thephases. When the impact modifier resides in the disperse phase, thecombined amount of impact modifier and poly(arylene ether) is less than35 weight percent (wt %), based on the total weight of the composition.The exact amount and types or combinations of poly(arylene ether),impact modifier and polyester will depend, in part, on the requirementsneeded in the final blend composition. Most often, the poly(aryleneether) and impact modifier are present in an amount of 5 to 35 wt %, or,more specifically, 10 to 25 wt %, based on the total weight of thecomposition.

In one embodiment the thermoplastic composition is made using a threelobe extruder. In this embodiment the composition can comprise up to 45wt % of a disperse phase comprising poly(arylene ether), based on thetotal weight of the composition. Despite having an increased amount ofdisperse phase the compositions meet or exceed the above mentionedcriteria for notched Izod strength and nominal strain at break.

In addition to the amount of the disperse phase it is also importantthat the composition be made using a polymeric compatibilizer having anaverage of greater than or equal to 3 pendant epoxy groups per molecule.The quantity of pendant epoxy groups can be calculated as follows: theaverage number of pendant epoxy groups=(Number average molecular weightof the compatibilizer (g/mol)×epoxy content (meq/kg))/1,000,000.

Without being bound by theory it is believed that the stable morphologyallows the composition to have a combination of excellent notched Izodstrength and nominal break strain.

In compositions free of electrically conductive filler, the compositionhas a notched Izod greater than or equal to 10 kilojoules per squaremeter, or, more specifically, greater than or equal to 15 kilojoules persquare meter. The notched Izod can be less than or equal to 120kilojoules per square meter. In compositions comprising electricallyconductive filler, the composition has a notched Izod greater than orequal to 6 kilojoules per square meter, or, more specifically, greaterthan or equal to 8 kilojoules per square meter. The notched Izod can beless than or equal to 50 kilojoules per square meter. As mentionedabove, notched Izod is determined according to ISO 180/1A.

In compositions free of electrically conductive filler, the compositionhas a nominal strain at break greater than or equal to 20%, or, morespecifically, greater than or equal to 25%. The nominal strain at breakcan be less than or equal to 100%. In compositions comprisingelectrically conductive filler, the composition has a nominal strain atbreak greater than or equal to 15%, or, more specifically, greater thanor equal to 17%. The nominal strain at break can be less than or equalto 75%. As mentioned above, nominal strain at break is determinedaccording to ISO 527.

In the specification and the claims, reference will be made to a numberof terms, which shall be defined to have the following meanings. Thesingular forms “a”, “an” and “the” include plural referents unless thecontext clearly dictates otherwise. “Optional” or “optionally” meansthat the subsequently described event or circumstance may or may notoccur, and that the description includes instances where the eventoccurs and instances where it does not. Notched Izod values and nominalstrain at break values described herein are determined at 23° C.

Poly(arylene ether) comprises repeating structural units of formula (I)

wherein for each structural unit, each Z¹ is independently halogen,unsubstituted or substituted C₁-C₁₂ hydrocarbyl with the proviso thatthe hydrocarbyl group is not tertiary hydrocarbyl, C₁-C₁₂hydrocarbylthio, C₁-C₁₂ hydrocarbyloxy, or C₂-C₁₂ halohydrocarbyloxywherein at least two carbon atoms separate the halogen and oxygen atoms;and each Z² is independently hydrogen, halogen, unsubstituted orsubstituted C₁-C₁₂ hydrocarbyl with the proviso that the hydrocarbylgroup is not tertiary hydrocarbyl, C₁-C₁₂ hydrocarbylthio, C₁-C₁₂hydrocarbyloxy, or C₂-C₁₂ halohydrocarbyloxy wherein at least two carbonatoms separate the halogen and oxygen atoms.

As used herein, the term “hydrocarbyl”, whether used by itself, or as aprefix, suffix, or fragment of another term, refers to a residue thatcontains only carbon and hydrogen. The residue can be aliphatic oraromatic, straight-chain, cyclic, bicyclic, branched, saturated, orunsaturated. It can also contain combinations of aliphatic, aromatic,straight chain, cyclic, bicyclic, branched, saturated, and unsaturatedhydrocarbon moieties. However, when the hydrocarbyl residue is describedas “substituted”, it can contain heteroatoms over and above the carbonand hydrogen members of the substituent residue. Thus, when specificallydescribed as substituted, the hydrocarbyl residue can also containhalogen atoms, nitro groups, cyano groups, carbonyl groups, carboxylicacid groups, ester groups, amino groups, amide groups, sulfonyl groups,sulfoxyl groups, sulfonamide groups, sulfamoyl groups, hydroxyl groups,alkoxyl groups, or the like, and it can contain heteroatoms within thebackbone of the hydrocarbyl residue.

The poly(arylene ether) can comprise molecules havingaminoalkyl-containing end group(s), typically located in an orthoposition to the hydroxy group. Also frequently present are tetramethyldiphenylquinone (TMDQ) end groups, typically obtained from reactionmixtures in which tetramethyl diphenylquinone by-product is present.

The poly(arylene ether) can be in the form of a homopolymer; acopolymer; a graft copolymer; an ionomer; or a block copolymer; as wellas combinations comprising two or more of the foregoing polymers.Poly(arylene ether) includes polyphenylene ether comprising2,6-dimethyl-1,4-phenylene ether units optionally in combination with2,3,6-trimethyl-1,4-phenylene ether units.

The poly(arylene ether) can be prepared by the oxidative coupling ofmonohydroxyaromatic compound(s) such as 2,6-xylenol and/or2,3,6-trimethylphenol. Catalyst systems are generally employed for suchcoupling; they can contain heavy metal compound(s) such as a copper,manganese or cobalt compound, usually in combination with various othermaterials such as a secondary amine, tertiary amine, halide orcombination of two or more of the foregoing.

At least a portion of the poly(arylene ether) is functionalized with apolyfunctional compound (functionalizing agent) such as a polycarboxylicacid or those compounds having in the molecule both (a) a carbon-carbondouble bond or a carbon-carbon triple bond and b) at least onecarboxylic acid, anhydride, amino, imide, hydroxy group or saltsthereof. Examples of such polyfunctional compounds include maleic acid,maleic anhydride, fumaric acid, and citric acid. The poly(arylene ether)can be functionalized prior to making the composition or can befunctionalized as part of making the composition. Furthermore, prior tofunctionalization the poly(arylene ether) can be extruded, for exampleto be formed into pellets. It is also possible for the poly(aryleneether) to be melt mixed with other additives that do not interfere withfunctionalization. Exemplary additives of this type include flameretardants, flow promoters, and the like.

In some embodiments the poly(arylene ether) can comprise 0.1 wt % to 90wt % of structural units derived from a functionalizing agent. Withinthis range, the poly(arylene ether) can comprise less than or equal to80 wt %, or, more specifically, less than or equal to 70 wt % ofstructural units derived from functionalizing agent, based on the totalweight of the poly(arylene ether).

The poly(arylene ether) can have a number average molecular weight of3,000 to 40,000 grams per mole (g/mol) and a weight average molecularweight of 5,000 to 80,000 g/mol, as determined by gel permeationchromatography using monodisperse polystyrene standards, a styrenedivinyl benzene gel at 40° C. and samples having a concentration of 1milligram per milliliter of chloroform. The poly(arylene ether) orcombination of poly(arylene ether)s has an initial intrinsic viscosityof 0.1 to 0.60 deciliters per gram (dl/g), as measured in chloroform at25° C. Initial intrinsic viscosity is defined as the intrinsic viscosityof the poly(arylene ether) prior to melt mixing with the othercomponents of the composition and final intrinsic viscosity is definedas the intrinsic viscosity of the poly(arylene ether) after melt mixingwith the other components of the composition. As understood by one ofordinary skill in the art the viscosity of the poly(arylene ether) maybe up to 30% higher after melt mixing. The percentage of increase can becalculated by (final intrinsic viscosity—initial intrinsicviscosity)/initial intrinsic viscosity. Determining an exact ratio, whentwo initial intrinsic viscosities are used, will depend somewhat on theexact intrinsic viscosities of the poly(arylene ether) used and theultimate physical properties that are desired.

The poly(arylene ether) is present in an amount of 5 to 30 wt % based onthe total weight of the entire composition. Within this range thepoly(arylene ether) may be present in an amount greater than or equal to10 wt %, or, more specifically, greater than or equal to 15 wt %.

Suitable polyesters include those comprising structural units of theformula (II):

wherein each R¹ is independently a divalent aliphatic, alicyclic oraromatic hydrocarbon radical, or mixtures thereof and each A¹ isindependently a divalent aliphatic, alicyclic or aromatic radical, ormixtures thereof. Examples of suitable polyesters comprising thestructure of formula (II) are poly(allylene dicarboxylate)s, liquidcrystalline polyesters, polyarylates, and polyester copolymers such ascopolyestercarbonates and polyesteramides. Also included are polyestersthat have been treated with relatively low levels of diepoxy ormulti-epoxy compounds. It is also possible to use branched polyesters inwhich a branching agent, for example, a glycol having three or morehydroxyl groups or a trifunctional or multifunctional carboxylic acidhas been incorporated. Treatment of the polyester with a trifunctionalor multifunctional epoxy compound, for example, triglycidyl isocyanuratecan also be used to make branched polyester. Furthermore, it issometimes desirable to have various concentrations of acid and hydroxylendgroups on the polyester, depending on the ultimate end-use of thecomposition.

In one embodiment at least some of the polyester comprises nucleophilicgroups such as, for example, carboxylic acid groups. In some instances,it is desirable to reduce the number of carboxylic end groups, typicallyto less than 20 micro equivalents per gram of polyester, with the use ofacid reactive species. In other instances, it is desirable that thepolyester has a relatively high carboxylic end group concentration, inthe range of 20 to 250 micro equivalents per gram of polyester or, morespecifically, 30 to 100 micro equivalents per gram of polyester.

In one embodiment, the R¹ radical in formula (II) is a C₂₋₁₀ allyleneradical, a C₆₋₁₀ alicyclic radical or a C₆₋₂₀ aromatic radical in whichthe alkylene groups contain 2-6 and most often 2 or 4 carbon atoms. TheA¹ radical in formula (II) is most often p- or m-phenylene or a mixturethereof. This class of polyesters includes the poly(alkyleneterephthalates), the poly(alkylene naphthanates) and the polyarylates.Exemplary poly(allylene terephthalates) include linear aliphaticpolyesters such as poly(ethylene terephthalate) (PET) and poly(butyleneterephthalate) (PBT), as well as cyclic aliphatic polyesters such aspoly(cyclohexanedimethanol terephthalate) (PCT). Exemplary poly(alkylenenaphthalate)s include poly(butylene-2,6-naphthalate) (PBN) andpoly(ethylene-2,6-naphthalate) (PEN). Other useful polyesters includepoly(ethylene-co-cyclohexanedimethanol terephthalate) (PETG),polytrimethylene terephthalate (PTT),poly(dimethanol-1,4-cyclohexanedicarboxylate) (PCCD), and polyxyleneterephthalate (PXT). Polyesters are known in the art as illustrated bythe following U.S. Pat. Nos. 2,465,319, 2,720,502, 2,727,881, 2,822,348,3,047,539, 3,671,487, 3,953,394, and 4,128,526.

Liquid crystalline polyesters having melting points less that 380° C.and comprising recurring units derived from aromatic diols, aliphatic oraromatic dicarboxylic acids, and aromatic hydroxy carboxylic acids arealso useful. Examples of useful liquid crystalline polyesters include,but are not limited to, those described in U.S. Pat. Nos. 4,664,972 and5,110,896. Mixtures of polyesters are also sometimes suitable.

The various polyesters can be distinguished by their corresponding glasstransition temperatures (Tg) and melting points (Tm). The liquidcrystalline polyesters generally have a Tg and Tm that are higher thanthe naphthalate-type polyesters. The naphthalate-type polyestersgenerally have a Tg and Tm that are higher than the terephthalate-typepolyesters. Thus, the resultant poly(arylene ether) alloys with theliquid crystalline or naphthalate-type polyesters are typically bettersuited to applications requiring higher temperature resistance than arethe terephthalate-type polyesters. The poly(arylene ether) alloys withterephthalate-type polyesters are generally easier to process due to thepolyesters' lower Tgs and Tms. Selection of the polyester or blend ofpolyesters utilized is therefore determined, in part, by the desiredproperty profile required by the ultimate end-use application for thecomposition.

Because of the tendency of polyesters to undergo hydrolytic degradationat the high extrusion and molding temperatures in some embodiments thepolyester is substantially free of water. The polyester may be predriedbefore admixing with the other ingredients. Alternatively, the polyestercan be used without predrying and the volatile materials can be removedby vacuum venting the extruder. The polyesters generally have numberaverage molecular weights in the range of 15,000-100,000, as determinedby gel permeation chromatography (GPC) at 30° C. in a 60:40 by weightmixture of phenol and 1,1,2,2-tetrachloroethane.

The composition can comprise 40 to 90 wt % of the polyester, based onthe total weight of the composition. Within this range the compositioncan comprise less than or equal to 80 wt %, or, more specifically, lessthan or equal to 75 wt %, or, even more specifically, less than or equalto 65 wt % polyester. Also within this range, the composition cancomprise greater than or equal to 45 wt %, or, more specifically,greater than or equal to 50 wt % polyester.

The composition also comprises an impact modifier. In many embodimentsthe impact modifier resides primarily in the poly(arylene ether) phase.Examples of suitable impact modifiers include block copolymers;elastomers such as polybutadiene; random copolymers such as ethylenevinyl acetate (EVA); and combinations comprising two or more of theforegoing impact modifiers.

Exemplary block copolymers include A-B diblock copolymers and A-B-Atriblock copolymers having one or two blocks A, which comprisestructural units derived from an alkenyl aromatic monomer, for examplestyrene; and a rubber block, B, which generally comprises structuralunits derived from a diene such as isoprene or butadiene. The dieneblock may be partially hydrogenated. Mixtures of these diblock andtriblock copolymers are especially useful.

Suitable A-B and A-B-A copolymers include, but are not limited to,polystyrene-polybutadiene; polystyrene-poly(ethylene-butylene);polystyrene-polyisoprene; polystyrene-poly(ethylene-propylene);poly(alpha-methylstyrene)-polybutadiene;poly(alpha-methylstyrene)-poly(ethylene-butylene);polystyrene-polybutadiene-polystyrene (SBS);polystyrene-poly(ethylene-butylene)-polystyrene (SEBS);polystyrene-polyisoprene-polystyrene;polystyrene-poly(ethylene-propylene)-polystyrene;poly(alpha-methylstyrene)-polybutadiene-poly(alpha-methylstyrene); aswell as selectively hydrogenated versions thereof, and the like, as wellas combinations comprising two or more of the foregoing impactmodifiers. Such A-B and A-B-A block copolymers are availablecommercially from a number of sources, including Phillips Petroleumunder the trademark SOLPRENE, Kraton Polymers, under the trademarkKRATON, Dexco under the trademark VECTOR, and Kuraray under thetrademark SEPTON

When present, the amount of the impact modifier is 5 wt % to 22 wt %,based on the total weight of the composition. Within this range, theimpact modifier may be present in amount greater than or equal to 8 wt%, or, more specifically, greater than or equal to 10 wt %. Also withinthis range, the impact modifier may be present in amount less than orequal to 20 wt %, or, more specifically, less than or equal to 18 wt %,or, even more specifically, less than or equal to 16 wt %. The exactamount and types or combinations of impact modifiers utilized willdepend in part on the requirements needed in the final blend compositionand may be determined by those skilled in the art.

In addition to the poly(arylene ether), polyester, and impact modifier,the composition is made using a polymeric compatibilizer having anaverage of greater than or equal to 3 pendant epoxy groups per molecule.In some embodiments the polymeric compatibilizer has an average ofgreater than or equal to 8 pendant epoxy groups per molecule, or, morespecifically, an average of greater than or equal to 11 pendant epoxygroups per molecule or, more specifically, an average of greater than orequal to 15 pendant epoxy groups per molecule or, more specifically, anaverage of greater than or equal to 17 pendant epoxy groups permolecule. As used herein and throughout, a polymeric compatibilizer is apolymeric polyfunctional compound that interacts with the poly(aryleneether), the polyester, or both. This interaction may be chemical (e.g.grafting) and/or physical (e.g. affecting the surface characteristics ofthe disperse phases). When the interaction is chemical, thecompatibilizer may be partially or completely reacted with thepoly(arylene ether), polyester, or both such that the compositioncomprises a reaction product. For example, the epoxy groups may reactwith acid groups present on the polyester, the functional groups on thefunctionalized poly(arylene ether) or both during melt blending. Use ofthe polymeric compatibilizer can improve the compatibility between thepoly(arylene ether) and the polyester, as may be evidenced by enhancedimpact strength, mold knit line strength, elongation and/or theformation of a distinctive two phase morphology. Such morphology isevidenced by the occurrence of two distinct phases within a molded part;a continuous phase comprising polyester and a disperse phase comprisingpoly(arylene ether). The disperse phase particles have an averageparticle diameter of 0.2 to 5 micrometers, or, more specifically, 0.5 to4 micrometers, or, even more specifically 0.5 to 3 micrometers. Theaverage particle diameter is the average circular diameter of at least100 particles and may be determined by scanning electron microscopy orby transmission electron microscopy. In the case of elliptical particles“circular diameter” is the mean of the major and minor axis of eachparticle. In other words, the diameters of the circumcircle and incircleare averaged for each elliptical particle.

Illustrative examples of suitable compatibilizers include, but are notlimited to, copolymers of glycidyl methacrylate (GMA) with alkenes,copolymers of GMA with alkenes and acrylic esters, copolymers of GMAwith alkenes and vinyl acetate, copolymers of GMA and styrene. Suitablealkenes comprise ethylene, propylene, and mixtures of two or more of theforegoing. Suitable acrylic esters comprise alkyl acrylate monomers,including, but not limited to, methyl acrylate, ethyl acrylate, propylacrylate, butyl acrylate, and combinations of the foregoing alkylacrylate monomers. When present, the acrylic ester may be used in anamount of 15 wt % to 35 wt % based on the total amount of monomer usedin the copolymer. When present, vinyl acetate may be used in an amountof 4 wt % to 10 wt % based on the total amount of monomer used in thecopolymer. Illustrative examples of suitable compatibilizers compriseethylene-glycidyl acrylate copolymers, ethylene-glycidyl methacrylatecopolymers, ethylene-glycidyl methacrylate-vinyl acetate copolymers,ethylene-glycidyl methacrylate-alkyl acrylate copolymers,ethylene-glycidyl methacrylate-methyl acrylate copolymers,ethylene-glycidyl methacrylate-ethyl acrylate copolymers, andethylene-glycidyl methacrylate-butyl acrylate copolymers.

Use of glycidyl methacrylate copolymers as a polymeric compatibilizer isknown in the art as illustrated by the following U.S. Pat. Nos.5,698,632 and 5,719,236. However, unlike the prior art which teaches thecompatibilizer can be compounds having two pendant epoxy groups permolecule as well as some mono-functional species, it has been discoveredthat the polymeric compatibilizer must have an average of greater thanor equal to 3 pendant epoxy groups per molecule, or, more specifically,an average of greater than or equal to 8 pendant epoxy groups, or, morespecifically, an average of greater than or equal to 11 pendant epoxygroups, or, more specifically, an average of greater than or equal to 15pendant epoxy groups, or, more specifically, an average of greater thanor equal to 17 pendant epoxy groups. Diglycidyl compounds do not exhibitthe required reactivity to form a composition with a stable phasemorphology.

The composition comprises 0.1 wt % to 20 wt % of polymericcompatibilizer, based on the total weight of the composition. Withinthis range, the composition can comprise less than or equal to 15 wt %,or, more specifically less than or equal to 10 wt %, or, even morespecifically, less than or equal to 8 wt % compatibilizer. Also withinthis range, the composition may comprise greater than or equal to 0.5 wt%, or, more specifically, greater than or equal to 1 wt %, or, even morespecifically, greater than or equal to 4 wt % compatibilizer.

The foregoing compatibilizer may be added directly to the composition orpre-reacted with either or both of the poly(arylene ether) andpolyester, as well as with other materials employed in the preparationof the composition. The initial amount of the compatibilizer used andorder of addition will depend upon the specific compatibilizer chosenand the specific amounts of poly(arylene ether) and polyester employed.

The composition may optionally comprise electrically conductive filler.The electrically conductive filler may be any filler that increases theelectrical conductivity of the molded composition. Suitable electricallyconductive fillers may be fibrous, disc-shaped, spherical or amorphousand include, for example, conductive carbon black; conductive carbonfibers, including milled fibers; conductive vapor-grown carbon fibers,and various mixtures thereof. Other electrically conductive fillerswhich can be used are metal-coated carbon fibers; metal fibers; metaldisks; metal particles; metal-coated disc-shaped fillers such asmetal-coated talcs, micas and kaolins; and the like. In some embodimentsthe electrically conductive fillers include carbon black, carbon fibers,and mixtures thereof, an illustrative example of which includes materialavailable commercially from Akzo Chemical under the trademark Ketjenblack EC600JD. In one embodiment, carbon black includes conductivecarbon blacks having average particle sizes of less than 200 nanometers,or, more specifically, less than 100 nanometers, or, even morespecifically, less than 50 nanometers. Conductive carbon blacks may alsohave surface areas greater than 200 square meters per gram (m²/g), or,more specifically, greater than 400 m²/g, or, even more specificallygreater than 1000 m²/g. Conductive carbon blacks may also have a porevolume (as measured by dibutyl phthalate absorption) of greater than 40cubic centrimeters per 100 grams (cm³/100 g), or, more specifically,greater than 100 cm³/100 g, or, even more specifically, greater than 150cm³/100 g. Conductive carbon blacks may also have a volatiles contentless than 2 weight percent. Useful carbon fibers include the graphiticor partially graphitic vapor-grown carbon fibers having diameters of 3.5to 500 nanometers, or, more specifically, diameters of 3.5 to 70nanometers, or, even more specifically, diameters of 3.5 to 50nanometers. Representative carbon fibers are the vapor-grown carbonfibers, such as those available from Hyperion and single wall nanotubessuch as those available from Carbon Nanotechnologies Incorporated (CNI).Conductive fillers of this type are described in, for example, U.S. Pat.Nos. 4,565,684 and 5,024,818 to Tibbetts et al.; U.S. Pat. No. 4,572,813to Arakawa; U.S. Pat. Nos. 4,663,230 and 5,165,909 to Tennent; U.S. Pat.No. 4,816,289 to Komatsu et al.; U.S. Pat. No. 4,876,078 to Arakawa etal.; U.S. Pat. No. 5,589,152 to Tennent et al.; and U.S. Pat. No.5,591,382 to Nahass et al.

Generally, the electrically conductive filler will be present in anamount of 0.2 weight percent to 20 weight percent based on the totalweight of the composition. The amount will depend on the nature of theconductive filler. For example, when the conductive filler is conductivecarbon black, the amount can be 1 to 10 wt %, or, more specifically, 1to 8 wt %, or, even more specifically, 1.4 to 7 wt %. When theconductive filler is a vapor-grown carbon fiber, the amount can be 0.2to 6 wt %, or, more specifically, 0.5 to 4 wt % based on the totalweight of the composition. Conductive filler amounts less than the abovelower limits often fail to provide adequate conductivity, while amountsgreater than the above upper limits may tend to make the final blendbrittle.

The composition may also comprise additives known in the art. Possibleinclude anti-oxidants, dyes, pigments, colorants, stabilizers, flameretardants, drip retardants, crystallization nucleators, metal salts,antistatic agents, plasticizers, lubricants, and combinations comprisingtwo or more of the foregoing additives. These additives are known in theart, as are their effective levels and methods of incorporation.Effective amounts of the additives vary widely, but they are usuallypresent in an amount of less than or equal to 50 wt %, based on thetotal weight of the composition. Amounts of these additives aregenerally 0.25 wt % to 2 wt %, based upon the total weight of thecomposition. The effective amount can be determined by those skilled inthe art without undue experimentation.

The composition may also comprise fillers as known in the art. Fillersmay include reinforcing fillers. Exemplary fillers include smallparticle minerals (e.g., clay, mica, talc, and the like), glass fibers,nanoparticles, organoclay, and the like and combinations comprising oneor more of the foregoing fillers. Fillers are typically used in amountsof 5 wt % to 50 wt %, based on the total weight of the composition.

The composition can be prepared using various techniques, includingbatch or continuous techniques that employ kneaders, extruders, mixers,and the like. For example, the composition can be formed as a melt blendemploying a twin-screw extruder. In one embodiment at least some of thecomponents are added sequentially. For example, the poly(arylene ether),the impact modifier, and functionalizing agent may be added to theextruder at the feed throat or in feeding sections adjacent to the feedthroat, while the polyester and polymeric compatibilizer, may be addedto the extruder in the subsequent feeding section downstream. A vacuumsystem may be applied to the extruder, prior to the second sequentialaddition, to generate a sufficient vacuum to lower the residual levelsof non-reacted functionalizing agent and any other volatile materials.In an alternative embodiment, the sequential addition of the componentsmay be accomplished through multiple extrusions. A composition may bemade by preextrusion of selected components, such as the poly(aryleneether), the impact modifier and the functionalizing agent to produce apelletized mixture. A second extrusion may then be employed to combinethe preextruded components with the remaining components. Theelectrically conductive filler, when used, can be added as part of amasterbatch or directly. The masterbatch or the electrically conductivefiller can be added either at the feedthroat or down stream. Theextruder may be a two lobe or three lobe twin screw extruder. It iscontemplated that a three lobe extruder may yield a composition withsignificantly higher notched Izod and nominal strain at break valueswhen compared to compositionally identical compositions made using a twolobe twin screw extruder.

The thermoplastic composition may be used in a variety of articles suchas sunshades, support elements, containers, covers, mailboxes, awnings,office furniture, partitions and the like. Compositions comprisingelectrically conductive filler can be powder coated.

Without further elaboration, it is believed that one skilled in the artcan, using the description herein, make and utilize the composition toits fullest extent. The following examples are included to provideadditional guidance to those skilled in the art in practicing theclaimed composition. The examples provided are merely representative ofthe work that contributes to the teaching of the composition.Accordingly, these examples are not intended to limit the invention, asdefined in the appended claims, in any manner.

EXAMPLES

Compositions described herein were typically extruded on a WP 25millimeter (mm) co-rotating intermeshing twin-screw extruder. Thecomponents of the compositions and their source are listed in Table 1.Unless otherwise specified, the poly(arylene ether), antioxidants,functionalizing agent, and impact modifier were added at the feed throatof the extruder and the polyester and polymeric compatibilizer wereadded downstream, unless otherwise specified. The extruder was set withbarrel temperatures of 150° C. to 300° C. The material was run at 15-20kilograms per hour (kg/hr) with the screw rotating at 400 rotations perminute (rpm) with a vacuum of 100 millibar (mbar)-500 mbar applied tothe melt during compounding. The torque was maintained at 60-65%. Allexamples were made using a two lobe extruder with the exception of theexamples shown in Table 3 and Examples 20-23 in Table 8 which were madeusing a three lobe extruder. The three lobe extruder was a WP 28millimeter co-rotating intermeshing twin-screw extruder. The three lobeextruder was set with barrel temperatures of 60° C. to 280° C. Thematerial was run at 5-15 kg/hr with the screw rotating at 300 rpm and avacuum of 100-500 mbar applied to the melt during compounding. Thetorque was maintained at 80-90%.

All samples were molded via injection molding with the molding machineset at 40-300° C. and mold set at 80° C., and tested for notched Izodimpact strength (in units of kilojoules per square meter; kJ/m²)according to ISO 180/1A. The tensile modulus (in units of gigaPascals;GPa) and % nominal strain at break (break strain %) were testedaccording to ISO 527. Heat resistance (Vicat B) was measured accordingto ISO 306 (in units of ° C.). Specific volume resistivity (SVR) wasdetermined as follows. A tensile bar was molded according to ISO 3167. Asharp, shallow cut was made near each end of the narrow central portionof the bar. The bar was fractured in a brittle fashion at each cut toseparate the narrow central portion, now having fractured ends withdimensions of 10×4 millimeters. If necessary to obtain fracturing in abrittle fashion, the tensile bar was first cooled, for example, in dryice or liquid nitrogen in a minus 40° C. freezer. The length of the barbetween the fractured ends was measured. The fractured ends of thesample were painted with conductive silver paint, and the paint wasallowed to dry. Using a multi-meter in resistance mode, electrodes wereattached to each of the painted surfaces, and the resistance wasmeasured at an applied voltage of 500-1000 millivolts. Values of thespecific volume resistivity were obtained by multiplying the measuredresistance by the fracture area of one side of the bar and dividing bythe length according to the equation ρ=R×A/L where ρ is the specificvolume resistivity in ohm-cm, R is the measured resistance in Ohms, A isthe fractured area in cm², and L is the sample length in cm. Thespecific volume resistivity values thus have units of Ohm-cm and arepresented as kilo Ohm-cm (k ohm cm). Domain particle size was analyzedby transmission electron microscopy (TEM) with a Philips CM12 TEM,operated at 120 kV. Micrographs of typical microstructures were taken atappropriate magnifications (4400× and 8800×). 100 nm sections requiredfor TEM studies were prepared by ultramicrotomy at room temperature.These sections were collected on a standard 3 mm, 400 mesh Cu TEM grid.TEM sections used to study the disperse phase were vapor stained withfreshly prepared RuO₄ solution for 30 seconds.

The component amounts of each of the compositions are shown in Tables2-6, along with physical properties of molded test parts. The amount ofeach component is expressed in weight percent based on the total weightof the composition.

TABLE 1 Component Trade name and Supplier PPE I Apoly(2,6-dimethyl-1,4-phenylene ether) having intrinsic viscosity of0.41 dl/g available from GE Plastics. PPE I-FA Prepared by extruding 2%by weight fumaric acid with PPE I PPE II A copolymer of2,6-dimethyl-1,4-phenylene ether and 2,3,6-trimethyl-1,4-phenylene etherhaving intrinsic viscosity of 0.39 dl/g available from GE Plastics.PBT315 A polybutylene terephthalate having an intrinsic viscosity of 1.2dl/g as measured in 1:1 weight to weight mixture of phenol:1,1,2,2-tetrachloro ethane at 30° C. available from GE Plastics PBT195 Apolybutylene terephthalate having an intrinsic viscosity of 0.70 dl/g asmeasured in 1:1 weight to weight mixture of phenol: 1,1,2,2-tetrachloroethane at 30° C. available from GE Plastics IQPBT315 A polybutyleneterephthalate made from recycled PET having an intrinsic viscosity of1.2 dl/g as measured in 1:1 weight to weight mixture of phenol:1,1,2,2-tetrachloro ethane at 30° C. available from GE Plastics. PET962A polyethylene terephthalate having an intrinsic viscosity of 0.80 dl/gas measured in 1:1 weight to weight mixture of phenol:1,1,2,2-tetrachloro ethane at 30° C. available from Accordis SEBSPolystyrene-poly(ethylene-butylene)-polystyrene available as KRATON 1651from KRATON Polymers. SEP Polystyrene-poly(ethylene-propylene) availableas KRATON 1701 from KRATON Polymers. BF E A polymeric compatibilizeravailable as BONDFAST E from Sumitomo Chemicals and having an epoxycontent around 900 meq/kg and a number average molecular weight (Mn) of19,000. The compatibilizer has an average of 17 pendant epoxy groups permolecule (avg epoxy groups = 17) J 4368 A polymeric compatibilizeravailable as Joncryl 4368 from Johnson Polymers having an epoxy contentaround 3500 meq/kg and an Mn of 6800. The compatibilizer has an averageof 24 pendant epoxy groups per molecule (avg epoxy groups = 24). J 4315A polymeric compatibilizer available as Joncryl 4315 from JohnsonPolymers having an epoxy content around 190 meq/kg and an Mn of 2100.The compatibilizer has an average of 0.4 pendant epoxy groups permolecule (avg epoxy groups = 0.4). J 4310 A polymeric compatibilizeravailable as Joncryl 4310 from Johnson Polymers having an epoxy contentaround 414 meq/kg and an Mn of 2900. The compatibilizer has an averageof 1.2 pendant epoxy groups per molecule (avg epoxy groups = 1.2). DGHHPDiglycidylhexahydrophthalate A available as SRHHPA from Sakamoto YakuhinKogyo having an epoxy content around 7000 meq/kg and an Mn of 284. Thecompatibilizer has an average of 2 pendant epoxy groups per molecule(avg epoxy groups = 2). CCB Conductive carbon black available as Ketjenblack EC 600JD from Akzo Nobel Functionalizing Citric acid from SD FineChemicals Ltd agent Stabilizer IRGANOX 1010 & IRGAFOS 168/Ciba SpecialtyChemicals

Examples 1-8 and Comparative Examples 1-4

The compositions and physical properties of Examples 1-8 and ComparativeExamples (CE) 1-4 are shown below in Table 2.

TABLE 2 Ex 1 Ex 2 CE 1 CE. 2 Ex 3 Ex 4 Ex 5 Ex 6 Ex 7 Ex 8 CE. 3* CE 4PPE I — — 29.4 17.5 — — 17.9 17.9 17.9 17.9 — — PPE I-FA — — — — — 1832.4 — PPE II 17.9 17.9 — 17.5 17.9 — — 31.9 SEBS 7 7 8 10 7 11 14.0 8.014.0 8.0 5 — SEP 7 7 — — 7 — — — BF E 6 6 4 6 7.5 6.0 6.0 7.5 6 Joncryl4368 1 1.0 1.0 PBT 195 64.6 66.0 72.0 PBT315 59.6 54.2 48.5 61 63.5 61.067.0 54.5 59.6 CCB 1.4 1.4 1.4 1.4 — — — — — — — — Functionalizing agent0.7 0.7 0.4 0.7 0.7 — 0.7 0.7 0.7 0.7 — 0.7 Stabilizer 0.5 0.5 0.5 0.50.5 — 0.5 0.5 0.5 0.5 0.5 0.5 Zn.St — — — — — — 0.2 — Total dispersephase 31.9 31.9 37.4 45 31.9 29 31.9 25.9 31.9 25.9 37.4 31.9 Avg epoxygroups 17 24 17 17 17 17 17 17 24 24 17 17 Tensile Modulus (GPa) 1.7 2.22 2 1.7 1.7 1.7 2.1 2.1 2.4 1.9 2.3 Break strain (%) 34 22.6 2.4 3.6 3836 28.0 25.0 20.0 18.0 12 8.5 Notched Impact (kJ/m²) 13 10.8 2.1 2 59 5822.0 19.0 14.0 10.0 6 5 Vicat B (° C.) 145 165 176 175 145 149 148.5162.0 157.0 171.0 180 188 SVR (k ohm cm) 4.2 143 0.1 0.8 — — — — — — — —*This comparative example correlates to Example 10 from U.S. Pat. No.5,719,236

Examples 1-8 and Comparative Examples 1-4 show the importance of thequantity of the disperse phase in compositions containing anelectrically conductive carbon black and in compositions not containingelectrically conductive carbon black.

Examples 1 and 2 contain electrically conductive carbon black and have adisperse phase content less than 35 wt %. Comparative Examples 1 and 2also contain electrically conductive carbon black but have a dispersephase content greater than 35 wt %. When the nominal strain at break(break strain) and notched Izod impact for Examples 1 and 2 are comparedto the nominal strain at break (break strain) and notched Izod impactfor Comparative Examples 1 and 2 there is a dramatic difference. Thenominal strain at break of Examples 1 and 2 is approximately 10× thenominal strain at break of Comparative Examples 1 and 2. The notchedIzod values for Examples 1 and 2 is approximately 5× the notched Izod ofComparative Examples 1 and 2.

Examples 3 to 8 when compared to Comparative Example 3 also show theimportance of the quantity of disperse phase. Examples 3 to 8 have anominal strain at break that is approximately 2× that of ComparativeExample 3 and a notched Izod value that is approximately 3× to 10× thatof Comparative Example 3. Comparative Example 4 shows the importance ofincluding an impact modifier.

Examples 9-11 and Comparative Examples 5-6

Examples 9-11 and Comparative Examples 5 and 6 demonstrate theimportance of the amount of the disperse phase when the composition ismade using a 3 lobe twin screw extruder. Compositions and physicalproperties are shown in Table 3.

TABLE 3 Ex 9 Ex 10 Ex 11 CE 5 CE 6 PPE I 17.8 17.8 17.8 29.4 29.4 SEBS14.0 14.0 14.0 20.0 14.0 J 4368 1.0 1.0 1.4 1.4 1.4 PBT195 65.0 64.865.0 47.2 53.0 CCB 1.4 1.6 1.4 1.4 1.4 Functionalizing agent 0.4 0.4 0.40.6 0.6 Stabilizer 0.5 0.5 0.5 0.5 0.5 Total disperse phase 31.8 31.831.8 49.4 43.4 Avg epoxy groups 24.0 24.0 24.0 24.0 24.0 Tensile Modulus(GPa) 2.0 2.0 2.0 1.8 2.1 Break strain (%) 30.0 30.0 26.0 3.3 6.5Notched Impact (kJ/m²) 12.0 12.0 13.4 5.4 6.4 Vicat B (° C.) 162 163 162146 163 SVR (k ohm cm) 10.0 10.0 66.0 0.3 0.7

Examples 9-11 have notched Izod values that are approximately 2× thenotched Izod values of Comparative Examples 5 and 6. Additionally,Examples 9-11 have nominal strain at break values that are more than 3×the nominal strain at break values of Comparative Examples 5-6.

Example 12 and Comparative Examples 7-9

Example 12 and Comparative Examples 7-9 show the importance of using apolymeric compatibilizer having an average of greater than or equal to 3pendant epoxy groups per molecule. Compositions and physical propertiesare shown in Table 4.

TABLE 4 Ex. 12 CE 7 CE 8 CE 9 PPE I 17.9 17.9 17.9 17.9 SEBS 7.0 7.0 7.07.0 SEP 7.0 7.0 7.0 7.0 J 4368 1.0 — — — J 4310 — — 8.5 — J 4315 — — —18.0 DGHHP — 0.5 — — PBT195 64.6 65.1 57.1 47.6 CCB 1.4 1.4 1.4 1.4Total disperse phase 31.9 31.9 31.9 31.9 Avg epoxy groups 24.0 2.0 1.20.4 Epoxy equivalent added 35.0 35.0 35.0 35.0 Functionalizing agent 0.70.7 0.7 0.7 Stabilizer 0.5 0.5 0.5 0.5 Tensile Modulus (GPa) 2.0 2.5 2.42.4 Break strain (%) 19.0 2.7 2.0 2.7 Notched Impact (kJ/m²) 9.0 1.9 2.01.9 Vicat B (° C.) 165.0 156.0 138.0 120.0 SVR (k ohm cm) 2.8 0.7 0.51.3

Table 4 demonstrates the importance of a polymeric compatibilizer havingan average of greater than or equal to 3 pendant epoxy groups permolecule. Both Example 12 and Comparative Examples 7-9 employ the sameoverall quantity of epoxy groups, thus ruling out an effect based on thetotal number of epoxy groups. Both Example 12 and Comparative Examples7-9 have the same amount of disperse phase. Example 12 differs fromComparative Examples 7-9 primarily in the average number of epoxy groupsper molecule in the polymeric compatibilizer. Example 12 has a nominalstrain at break that is at least 8× the nominal strain at break ofComparative Examples 7-9. Example 12 also has a notched Izod value thatis at least 4× the notched Izod of Comparative Examples 7-9.

Transmission electron micrographs of Example 12 and Comparative Examples7-9 are shown in the figures. FIG. 1 is a micrograph of Example 12 aftermolding. The continuous light gray phase corresponds to the continuousphase comprising polyester and the dark gray phase corresponds to thedispersed phase comprising poly(arylene ether). The dispersed phase hasan average particle diameter of 0.4 micrometers. FIG. 2 is a micrographof Example 12 after molding and annealing of the molded sample for 8minutes at 280° C. The micrograph shows the stability of dispersed phaseon annealing indicating that the composition has a stable morphology.There was no statistically significant change in the average particlediameter of the disperse phase. FIG. 3 is a micrograph of ComparativeExample 7 after molding. The sample has larger disperse phase particleswhen compared to Example 12. FIG. 4 is a micrograph of ComparativeExample 7 after molding and annealing for 8 minutes at 280° C. Themicrograph shows that there is coalescence of the disperse phase onannealing. Coalescence indicates that the morphology is not stable. FIG.5 is a micrograph of Comparative Example 8 after molding. The samplealso has larger disperse phase particles when compared to Example 12.FIG. 6 is a micrograph of Comparative Example 8 after molding andannealing for 8 minutes at 280° C. The micrograph shows that there iscoalescence of the disperse phase on annealing. FIG. 7 is a micrographof Comparative Example 9 after molding. The sample also has largerdisperse phase particles when compared to Example 12. FIG. 8 is amicrograph of Comparative Example 9 after molding and annealing for 8minutes at 280° C. The micrograph shows that there is coalescence of thedisperse phase on annealing.

Examples 13-16

Examples 13-16 show the feasibility of using different polyesters.Compositions and physical properties are shown in Table 5.

TABLE 5 Ex. 13 Ex. 14 Ex. 15 Ex. 16 PPE I — — — 17.9 PPE II 17.9 17.917.9 — SEBS 7.0 7.0 7.0 7.0 SEP 7.0 7.0 7.0 7.0 BF E 6.0 6.0 6.0 6.0 J4368 — — — — PBT315 59.6 44.7 29.8 — IQPBT315 — — — 59.6 PET962 — 14.929.8 — CCB 1.4 1.4 1.4 1.4 Functionalizing agent 0.7 0.7 0.7 0.7Stabilizer 0.5 0.5 0.5 0.5 Total disperse phase 31.9 31.9 31.9 31.9 Avgepoxy groups 17.0 17.0 17.0 17.0 Tensile Modulus (GPa) 1.7 1.7 1.7 1.6Break strain (%) 34.0 28.7 26.7 18.8 Notched Impact (kJ/m²) 13.0 10.211.5 8.3 Vicat B (° C.) 145.0 135.7 126.0 136.0 SVR (k ohm cm) 4.2 231.097.2 2.5

Table 5 demonstrates the invention is not limited to polybutyleneterephthalate polyesters (PBT). Mixtures of polyethylene terephthalate(PET) and PBT were evaluated as well as the use of a polybutyleneterephthalate made from recycled polyethylene terephthalate. TheExamples were all able to meet the notched Izod and nominal strain atbreak criteria for compositions containing electrically conductivefiller.

Examples 17 and Comparative Examples 10-11

Example 17 and Comparative Examples 10-11 show the importance offunctionalizing the poly(arylene ether) and adding the polymericcompatibilizer after the poly(arylene ether) and functionalizing agenthave reacted. Compositions and physical properties are shown in Table 6.

TABLE 6 Ex. 17 CE. 10 CE. 11 PPE II 17.9 17.9 17.9 SEBS 7.0 7.0 7.0 SEP7.0 7.0 7.0 BF E 6.0 6.0 6.0 PBT315 59.6 60.3 59.6 CCB 1.4 1.4 1.4Functionalizing agent 0.7 — 0.7 Stabilizer 0.5 0.5 0.5 Total dispersephase 31.9 31.9 31.9 Avg epoxy groups 17.0 17.0 17.0 Tensile Modulus(GPa) 1.7 1.6 1.7 Break strain (%) 34.0 6.2 3.5 Notched Impact (kJ/m²)13.0 2.6 2.0 Vicat B (° C.) 145.0 139.0 148.0 SVR (k ohm cm) 4.2 167.00.5

Comparative Example 10 contain all the ingredients of Example 17 butlacks in the functionalizing agent and shows lower nominal strain atbreak and notched Izod values. Comparative Example 11 employs the samecomponents as Example 17, differing in the order of addition of the BF E(polymeric compatibilizer). In Comparative Example 11, thecompatibilizer was added to the feed throat compared to Example 17whereby it was added downstream. Example 17 shows significantly highernominal strain at break and notched Izod values compared to ComparativeExample 11.

Examples 18-19

Examples 18 through 23 are a comparison of the effects of melt mixing onthe poly(arylene ether). Examples 18, 20, and 22 were made with “new”poly(arylene ether), poly(arylene ether) that had been polymerized andused directly in the composition. Examples 19, 21 and 23 were made withpoly(arylene ether) that was polymerized, extruded into pellets, andthen used in the composition. Compositions and physical properties areshown in Table 7.

TABLE 7 Ex 18 Ex 19 Ex. 20 Ex. 21 Ex. 22 Ex. 23 PPE I 17.9 — 17.9 — 17.9— Extruded PPE I — 17.9 — 17.9 — 17.9 SEBS 7.0 7.0 14.0 14.0 14.0 14.0SEP 7.0 7.0 — — — — J 4368 1.0 1.0 1.0 1.0 1.0 1.0 PBT195 64.6 64.6 66.366.3 64.6 64.6 CCB 1.4 1.4 — — 1.6 1.6 Functionalizing 0.7 0.7 0.4 0.40.4 0.4 agent Stabilizer 0.5 0.5 0.5 0.5 0.5 0.5 Total disperse phase31.9 31.9 31.9 31.9 31.9 31.9 Avg epoxy groups 24.0 24.0 24.0 24.0 24.024.0 Tensile Modulus 2.0 2.1 2.0 2.0 2.0 2.0 (GPa) Break strain (%) 19.018.0 33.6 33.6 31.32 18.76 Notched Impact 9.0 7.0 15.8 12.4 12.7 9.5(kJ/m²) Vicat B (° C.) 165.0 163.0 163.1 163.1 162.3 162.5 SVR (k ohmcm) 2.8 120.0 — — 9 39

A comparison of Examples 18 and 19, Examples 20 and 21, and Examples 21and 22 shows that using poly(arylene ether) that has already been meltmixed prior to the formation of the composition has little or no impacton the physical properties of the composition.

The terms “first,” “second,” and the like, “primary,” “secondary,” andthe like, “(a),” “(b)” and the like, as used herein do not denote anyorder, quantity, or importance, but rather are used to distinguish oneelement from another. The endpoints of all ranges directed to the samecomponent or property are inclusive of the endpoint and independentlycombinable. Reference throughout the specification to “one embodiment,”“another embodiment,” “an embodiment,” “some embodiments,” and so forth,means that a particular element (e.g., feature, structure, property,and/or characteristic) described in connection with the embodiment isincluded in at least one embodiment described herein, and may or may notbe present in other embodiments. In addition, it is to be understoodthat the described element(s) may be combined in any suitable manner inthe various embodiments.

While the invention has been illustrated and described in typicalembodiments, it is not intended to be limited to the details shown,since various modifications and substitutions can be made withoutdeparting in any way from the spirit of the present invention. As such,further modifications and equivalents of the invention herein disclosedmay occur to persons skilled in the art using no more than routineexperimentation, and all such modifications and equivalents are believedto be within the spirit and scope of the invention as defined by thefollowing claims. All patents and published articles cited herein areincorporated herein by reference.

1. A thermoplastic composition comprising: a polyester; a poly(aryleneether) wherein a portion of the poly(arylene ether) is functionalizedpoly(arylene ether); electrically conductive filler and an impactmodifier; wherein the composition comprises a continuous phasecomprising polyester and a disperse phase comprising poly(arylene ether)and impact modifier and the amount of the disperse phase is less than 35weight percent, based on the total weight of the composition, whereinthe composition has a notched Izod value greater than or equal to 6kilojoules per square meter as determined by ISO 180/1A and a nominalstrain at break greater than or equal to 15% as determined by ISO 527,and wherein the poly(arylene ether) is present in an amount of 5 to 30weight percent, the polyester is present in an amount of 40 to 90 weightpercent, the impact modifier is present in an amount of 5 to 22 weightpercent, and the electrically conductive filler is present in an amountof 0.2 to 20 weight percent, wherein all weight percents are based onthe total weight of the entire composition.
 2. The composition of claim1, wherein the combined amount of impact modifier and poly(aryleneether) is less than 35 weight percent, based on the total weight of thecomposition.
 3. The composition of claim 1, wherein the composition hasa notched Izod value greater than or equal to 8 kilojoules per squaremeter as determined by ISO 180/1A and a nominal strain at break greaterthan or equal to 17% as determined by ISO
 527. 4. The composition ofclaim 1, wherein the disperse phase has an average particle diameter of0.2 to 5 micrometers.
 5. The composition of claim 1, wherein thepoly(arylene ether) is melt mixed prior to forming the composition. 6.The composition of claim 1, wherein the polyester is a linear aliphaticpolyester.
 7. The composition of claim 1, wherein the impact modifier isa block copolymer or combination of block copolymers.
 8. An articlecomprising the thermoplastic composition of claim
 1. 9. A thermoplasticcomposition comprising: 40 to 90 weight percent of a linear aliphaticpolyester; 5 to 30 weight percent of a poly(arylene ether) wherein aportion of the poly(arylene ether) is functionalized poly(aryleneether); 0.2 to 20 weight percent of an electrically conductive filler;and 5 to 22 weight percent of an impact modifier; wherein thecomposition comprises a continuous phase comprising polyester and adisperse phase comprising poly(arylene ether) and impact modifier andthe amount of the disperse phase is less than 35 weight percent, basedon the total weight of the composition, wherein the composition has anotched Izod value greater than or equal to 6 kilojoules per squaremeter as determined by ISO 180/1A and a nominal strain at break greaterthan or equal to 15% as determined by ISO 527, and wherein weightpercents are based on the total weight of the composition.
 10. Anarticle comprising the thermoplastic composition of claim
 9. 11. Athermoplastic composition comprising: 40 to 90 weight percent, based onthe total weight of the composition, of a polybutylene terephthalate; 5to 30 weight percent, based on the total weight of the composition, of apoly(arylene ether) wherein a portion of the poly(arylene ether) isfunctionalized poly(arylene ether); 0.2 to 20 weight percent, based onthe total weight of the composition, of an electrically conductivefiller; and 5 to 22 weight percent, based on the total weight of thecomposition, of an impact modifier comprising a block copolymer or acombination of block copolymers; wherein the composition comprises acontinuous phase comprising polybutylene terephthalate and a dispersephase comprising poly(arylene ether) and impact modifier and the amountof the disperse phase is less than 35 weight percent, based on the totalweight of the composition, and wherein the composition has a notchedIzod value greater than or equal to 6 kilojoules per square meter asdetermined by ISO 180/1A and a nominal strain at break greater than orequal to 15% as determined by ISO
 527. 12. A thermoplastic compositionproduced by melt blending: a polyester; a poly(arylene ether) wherein aportion of the poly(arylene ether) is functionalized poly(aryleneether); an impact modifier; an electrically conductive filler; and apolymeric compatibilizer having an average of greater than or equal to 3pendant epoxy groups per molecule; wherein the composition comprises acontinuous phase comprising polyester and a disperse phase comprisingpoly(arylene ether) and impact modifier and the amount of the dispersephase is less than 35 weight percent, based on the total weight of thecomposition, wherein the composition has a notched Izod greater than orequal to 6 kilojoules per square meter, as determined by ISO 180/1A anda nominal strain at break greater than or equal to 15% as determined byISO 527, and wherein the poly(arylene ether) is present in an amount of5 to 30 weight percent, the polyester is present in an amount of 40 to90 weight percent, the impact modifier is present in an amount of 5 to22 weight percent, and the electrically conductive filler is present inan amount of 0.2 to 20 weight percent, wherein all weight percents arebased on the total weight of the entire composition.
 13. The compositionof claim 12, wherein the combined amount of impact modifier andpoly(arylene ether) is less than 35 weight percent (wt %), based on thetotal weight of the composition.
 14. The composition of claim 12,wherein the composition has a notched Izod value greater than or equalto 8 kilojoules per square meter as determined by ISO 180/1A and anominal strain at break greater than or equal to 17% as determined byISO
 527. 15. The composition of claim 12, wherein the polymericcompatibilizer has an average of greater than or equal to 8 pendantepoxy groups per molecule.
 16. The composition of claim 15, wherein thepolymeric compatibilizer has an average of greater than or equal to 11pendant epoxy groups per molecule.
 17. The composition of claim 16,wherein the polymeric compatibilizer has an average of greater than orequal to 15 pendant epoxy groups per molecule.
 18. The composition ofclaim 17, wherein the polymeric compatibilizer has an average of greaterthan or equal to 17 pendant epoxy groups per molecule.
 19. Thecomposition of claim 12, wherein the polyester is a linear aliphaticpolyester.
 20. The composition of claim 12, wherein the impact modifieris a block copolymer or combination of block copolymers.
 21. An articlecomprising the thermoplastic composition of claim
 12. 22. Athermoplastic composition produced by melt blending: a polyester; apoly(arylene ether); an impact modifier; a functionalizing agent; anelectrically conductive filler; and a polymeric compatibilizer having anaverage of greater than or equal to 3 pendant epoxy groups per molecule,wherein the composition has a notched Izod greater than or equal to 6kilojoules per square meter, as determined by ISO 180/1A and a nominalstrain at break greater than or equal to 15% as determined by ISO 527,and wherein the poly(arylene ether) is present in an amount of 5 to 30weight percent, the polyester is present in an amount of 40 to 90 weightpercent, the impact modifier is present in an amount of 5 to 22 weightpercent, and the electrically conductive filler is present in an amountof 0.2 to 20 weight percent, wherein all weight percents are based onthe total weight of the entire composition, and wherein the compositioncomprises a continuous phase comprising polyester and a disperse phasecomprising poly(arylene ether) and impact modifier and the amount of thedisperse phase is less than 35 weight percent, based on the total weightof the composition.
 23. The composition of claim 22, wherein thecomposition has a notched Izod value greater than or equal to 8kilojoules per square meter as determined by ISO 180/1A and a nominalstrain at break greater than or equal to 17% as determined by ISO 527.24. The composition of claim 22, wherein the polymeric compatibilizerhas an average of greater than or equal to 8 pendant epoxy groups permolecule.
 25. The composition of claim 24, wherein the polymericcompatibilizer has an average of greater than or equal to 11 pendantepoxy groups per molecule.
 26. The composition of claim 25, wherein thepolymeric compatibilizer has an average of greater than or equal to 15pendant epoxy groups per molecule.
 27. The composition of claim 26,wherein the polymeric compatibilizer has an average of greater than orequal to 17 pendant epoxy groups per molecule.
 28. The composition ofclaim 22, wherein the polyester is a linear aliphatic polyester.
 29. Thecomposition of claim 22, wherein the impact modifier is a blockcopolymer or combination of block copolymers.
 30. An article comprisingthe thermoplastic composition of claim
 22. 31. A thermoplasticcomposition produced by melt blending: 40 to 90 weight percent, based onthe total weight of the composition, of a polybutylene terephthalate; 5to 30 weight percent, based on the total weight of the composition, of apoly(arylene ether) wherein a portion of the poly(arylene ether) isfunctionalized poly(arylene ether); 5 to 22 weight percent, based on thetotal weight of the composition, of an impact modifier; 0.2 to 20 weightpercent, based on the total weight of the composition, of anelectrically conductive filler; and 0.1 to 20 weight percent, based onthe total weight of the composition, of a polymeric compatibilizerhaving an average of greater than or equal to 3 pendant epoxy groups permolecule; wherein the composition comprises a continuous phasecomprising polyester and a disperse phase comprising poly(arylene ether)and impact modifier and the amount of the disperse phase is less than 35weight percent, based on the total weight of the composition, whereinthe composition has a notched Izod greater than or equal to 6 kilojoulesper square meter, as determined by ISO 180/1A and a nominal strain atbreak greater than or equal to 15% as determined by ISO
 527. 32. Athermoplastic composition produced by melt blending: 40 to 90 weightpercent, based on the total weight of the composition, of a polybutyleneterephthalate 5 to 30 weight percent, based on the total weight of thecomposition, of a poly(arylene ether); 5 to 22 weight percent, based onthe total weight of the composition, of an impact modifier; afunctionalizing agent; 0.2 to 20 weight percent, based on the totalweight of the composition, of an electrically conductive filler; and 0.1to 20 weight percent, based on the total weight of the composition, of apolymeric compatibilizer having an average of greater than or equal to 3pendant epoxy groups per molecule wherein the composition comprises acontinuous phase comprising polybutylene terephthalate and a dispersephase comprising poly(arylene ether) and impact modifier and the amountof the disperse phase is less than 35 weight percent, based on the totalweight of the composition, and, wherein the composition has a notchedIzod greater than or equal to 6 kilojoules per square meter, asdetermined by ISO 180/1A and a nominal strain at break greater than orequal to 15% as determined by ISO
 527. 33. An article comprising athermoplastic composition, wherein the thermoplastic compositioncomprises: 40 to 90 weight percent, based on the total weight of thecomposition, of a polybutylene terephthalate; 5 to 30 weight percent,based on the total weight of the composition, of a poly(arylene ether)wherein a portion of the poly(arylene ether) is functionalizedpoly(arylene ether); 0.2 to 20 weight percent, based on the total weightof the composition, of an electrically conductive filler; and 5 to 22weight percent, based on the total weight of the composition, of animpact modifier comprising a block copolymer or a combination of blockcopolymers; wherein the composition comprises a continuous phasecomprising polybutylene terephthalate and a disperse phase comprisingpoly(arylene ether) and impact modifier and the amount of the dispersephase is less than 35 weight percent, based on the total weight of thecomposition, and wherein the composition has a notched Izod valuegreater than or equal to 6 kilojoules per square meter as determined byISO 180/1A and a nominal strain at break greater than or equal to 15% asdetermined by ISO 527.